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Old 04-29-2016, 12:23 PM   #11
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An RV water pump is a diaphragm pump and in most cases running dry won't hurt it. I've inadvertently run mine for many hours dry with no damage. The diaphragm could have a hole in it allowing the water to run back into the tank. Like other folks mentioned you'd have to either replace the pump or put a valve just before or after the pump to verify this.
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Old 04-29-2016, 12:56 PM   #12
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Whenever mine did this, the cause was a leaky backflow prevention in the water pump. Those were all used pumps with some miles on them. Yours is new. If it's a faulty check valve or internal backflow prevention, it should be under warranty. However, it could also be leftover plastic "chips" from drilling the connections on your water tank. If the tank was not completely flushed by mfg, dealer, or by you, those chips can lodge in the water pump and cause a leak. A very small leak can cause cycling.

This all assumes, of course, you don't have a leak elsewhere in the system that you may not be able to see. Check under your coach at all connections, and as someone said earlier, check your low point drains to ensure they are fully seated.
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Old 04-29-2016, 01:44 PM   #13
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Lots of potential areas for leaks. You could have a little construction debris that is stuck somewhere, such in the diaphragm or in a low point drain valve. Depending on the debris it might have nicked an O-ring.

Here are some of the spots I have had issues with over the years; Low point drain had a small leak, could see a wet spot under the trailer at the drain points, had to lube the O-ring. The screen filter just before the pump had lots of hairline fractures (1st year), replaced the cup and the pump cycling went a way, it did not leak water, but it did allow air to pass through the cracks and into the system. A couple of thumb screws that secure the pex water lines to the faucets were loose, I noticed water droplets under the sinks, this happened after the first few trips, hand tightened. Outside shower faucet, when placing the shower head back into the tiny compartment I have turned the valve very slightly and had a leaky shower head, done this many times.

If your pump is cycling you have a leak somewhere. The last place I would expect is the pump diaphragm, and it is the hardest to verify and get to.
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Old 04-29-2016, 01:55 PM   #14
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Mine's been doing that for quite a while now. I've checked for leaks several times and found none, so it's got to be in the pump itself, probably a gunked up check valve. Heck, maybe I'll tear it apart today and see if I can fix it.
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Old 04-29-2016, 02:39 PM   #15
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Wow

THANK YOU all for the excellent information.

The dealer said they pressure tested the plumbing and found no leaks. So could it follow that the pump really is the problem? It is leaking back or not holding?

Or is the pump part of that pressure test.

Very interesting stuff. I would have thought they'd be able to tell it was the pump the easiest.
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Old 04-29-2016, 02:57 PM   #16
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Quote:
Originally Posted by dangerdave View Post
THANK YOU all for the excellent information.

The dealer said they pressure tested the plumbing and found no leaks. So could it follow that the pump really is the problem? It is leaking back or not holding?

Or is the pump part of that pressure test.

Very interesting stuff. I would have thought they'd be able to tell it was the pump the easiest.
Just my opinion, but your dealer didn't go far enough...
If there are no leaks,
then the pump must be defective.
They should have replaced the pump.
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Old 04-29-2016, 09:51 PM   #17
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Had the same problem, accept my pump was cycling every 5 seconds. This started after an improper winterization by the dealer. Pump was replaced as a warranty item after a pressure testing of the lines passed.
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